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paulmars Posted - May 25 2010 : 11:47:59 AM
honeywell central AC/heat Electronic fan timer st9103a 1036. Honeywell is no help. They want me to buy a new board for 150$. I believe its the IC (opto sensor) on the board that's bad. I have not been able to find a schematic of this board. The IC is labeled:
L 9948
814
(large dot) Y

I've tried a few on line part suppliers and they cant identify it. It has four pins.

Home was hit by lightning and it fried 3 items on 3 different house circuits One was the AC. The above board is telling the fan to turn on, even though the thermostat is off. I've troubleshooted and believe its this IC and want to replace it.

Can anyone help me finding the original manufacturer or a generic replacement?

(Edit...Move to Electronics Repair)
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BEatonNo1 Posted - Jul 29 2010 : 11:00:31 PM
Try pulling the part out and see if it fixes the fan. I have seen that when Lightning is involved most items on the board are fried...or fail after a few more hours of operation.

http://www.mouser.com/Optoelectronics/Optocouplers-Photocouplers/_/N-6x5ji?Keyword=814&FS=True

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